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# Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license
import struct
import dns.enum
import dns.exception
import dns.immutable
import dns.rdata
import dns.rdatatype
import dns.rdtypes.util
class UnknownScheme(dns.exception.DNSException):
"""Unknown DSYNC scheme"""
class Scheme(dns.enum.IntEnum):
"""DSYNC SCHEME"""
NOTIFY = 1
@classmethod
def _maximum(cls):
return 255
@classmethod
def _unknown_exception_class(cls):
return UnknownScheme
@dns.immutable.immutable
class DSYNC(dns.rdata.Rdata):
"""DSYNC record"""
# see: draft-ietf-dnsop-generalized-notify
__slots__ = ["rrtype", "scheme", "port", "target"]
def __init__(self, rdclass, rdtype, rrtype, scheme, port, target):
super().__init__(rdclass, rdtype)
self.rrtype = self._as_rdatatype(rrtype)
self.scheme = Scheme.make(scheme)
self.port = self._as_uint16(port)
self.target = self._as_name(target)
def to_text(self, origin=None, relativize=True, **kw):
target = self.target.choose_relativity(origin, relativize)
return (
f"{dns.rdatatype.to_text(self.rrtype)} {Scheme.to_text(self.scheme)} "
f"{self.port} {target}"
)
@classmethod
def from_text(
cls, rdclass, rdtype, tok, origin=None, relativize=True, relativize_to=None
):
rrtype = dns.rdatatype.from_text(tok.get_string())
scheme = Scheme.make(tok.get_string())
port = tok.get_uint16()
target = tok.get_name(origin, relativize, relativize_to)
return cls(rdclass, rdtype, rrtype, scheme, port, target)
def _to_wire(self, file, compress=None, origin=None, canonicalize=False):
three_ints = struct.pack("!HBH", self.rrtype, self.scheme, self.port)
file.write(three_ints)
self.target.to_wire(file, None, origin, False)
@classmethod
def from_wire_parser(cls, rdclass, rdtype, parser, origin=None):
(rrtype, scheme, port) = parser.get_struct("!HBH")
target = parser.get_name(origin)
return cls(rdclass, rdtype, rrtype, scheme, port, target)
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